I am not an Axie person and I am sure you will get lots of help. One thing, well two actually, that strikes me is that what you describe might indeed be a fungus. If so Ampicillin is an antibiotic and will have no effect on the fungus. You need an anti-fungal and they are rather dose dependant. If too light it will be ineffective. If too heavy it will be toxic. You will definetly need the help of a vet or someone like Ed who can get you accurate dosing info. The secong thing is increasing the tank temp. Most pathogens and disease processes will not be deterred by the increased temp. Many in fact will in turn see an increase in activity. Additionally, the higher temp will stress the Axie and that will lower its ability to mount an effective immune response. Not that he/she will be able to do it alone but with proper meds and TLC..... Good luck and keep us posted